Get a Barnack! You won't get the feeling of that way of shooting (a historical thing) with an M2... I guess you have great "tools" already, but if you get a camera (M2) with the possibility of different frame lines, and with one single window both for VF (composing) and RF (focusing), you'll never know what the simpler design of Barnacks makes us do as photographers...
As you, I used my two Bessas T (apart from other RFs and SLRs) before I got my Barnack... It's a very nice experience: every photographer should have a Barnack... I got a cheap IIIF Black Dial from KEH (Bargain) and sent it to Youxin Ye... Indeed KEH did send the camera to Youxin, so I received it "new"... Price for camera and Youxin's great work was less than $300... Then I got a collapsible I-50 (3.5) just as good as original Leica Elmars, but coated, and then a Jupiter-3 (50 1.5) for speed and selective focus... Both lenses less than $300 again... During the 50's some FSU lenses used Zeiss optical designs, German machinery, German technicians and even German (Zeiss) glass... Some samples have problems, but good ones are very very good.
So, $500-$600 for a Barnack, the camera than begun it all (to exaggerate it a bit), a great collapsible 50, and a great fast 50, and the camera CLA'd by a wonderful technician, means I got a lot for little money
An M2 doesn't replace a Barnack, because an M2 (as other forum member pointed) is -even if a totally great and beautiful camera- one that's a lot closer to our days and to most modern RFs... With the more basic and slow ways of shooting a Barnack imposes, we feel and shoot differently... A most important reason to get one!!
Cheers,
Juan